POSCA PC-5M Poster Coloured Markers are made using a non-toxic, water based formula which produces dense, vibrant colours on a variety of surfaces. The markers are permanent on most porous surfaces and are removable on glass. - The marker has a medium bullet tip that measures 2.5 mm. - It can be used on a variety of surfaces including paper, metal, glass, wood and plastic. - The ink is vibrant, fade resistant and quick drying. -The marker is acid-free and non-toxic for your peace of mind. Contains one each of Blue, Light Blue, Navy & Sky Blue